What is the difference between "lockin" period and normal 11 months rental let out in a rental agreement?

Situation : I took a room for rent for setting up a grocery shop in Malawani,Mumbai on 17th May,2018.
In the rental agreement it was written 11 months
rental let out. There was not mentioned any lock in period as such anywhere(even in
miscelleneous section).
Now due to shop's detoriated sell condition , I suffered heavy loss during
first one month and wanted to vacate the shop room at the end of the two
months in the 17th July,2018. I gave a written application one week before
on 12th July,2018 and told the owner of shop room that I want to vacate the
house by 20th July,2018. I paid Rs80,000/- as security deposit. I also did
all the maintenance including the paint of the entire shop room of 370sq ft.
The rent of the shop room is 24 thousands per month.
Also I paid rent of first month(on 17th June,2018. )
Now , the owner wants to give me only Rs20,000/- as settlement money
(taking both two months rent(one rent from 17th June,2018 to 17th July,2018)
+one month extra of Rs24,000/- till 17th August,2018) and electricity charge
of last month).
According to me the owner cannot cut the extra one month rent of Rs24,000
upto 20th August,2018 as already I vacated the shop on 17th July,20

The rent room owner has no right to deduct the August month rent, he has only to deduct the july month rent only if you bear own expenses for paint. You have to issue a legal notice in this regard against the said room rent owner immedaitely for recovery of the said money. All the best.